As someone who runs 12th on Asphalt a fair bit the concept of a control tyre frightens me. Because you are outdoors especially changes in the weather can take you outside the tunable range of a given set of tyres, meaning you could have a situation where driving would not be fun.
A control family of tyres (so a range of shore ratings front and rear) to choose from on the other hand for a large event like this would be good, especially if they'll all be on hand to purchase at the meeting.